We use Rackspace Cloud Sites and provide that same hosting to all our Joomla clients with no problems.

 

Here is a link to the area of the site I originally was having problems with: www.masonco.com/accessoriesparts/replacement-partsWe don't have any problems and I think the initial problem was due to image size but I'm not 100% sure what we did to fix the slow loading.

turn on debugging and tell us how many queries are being executed

Hello. Experiencing the same problem. The more materials or categories website slower works. How to solve the problem?

Did you enable caching?
Are you using the correct image sizes?
If not then you might be donwload a 6mb page when you open the category.

Is your hosting providing reliable and fast?